CN104942219A - Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent - Google Patents
Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent Download PDFInfo
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- CN104942219A CN104942219A CN201510460141.6A CN201510460141A CN104942219A CN 104942219 A CN104942219 A CN 104942219A CN 201510460141 A CN201510460141 A CN 201510460141A CN 104942219 A CN104942219 A CN 104942219A
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- parts
- sodium chloride
- calcium carbonate
- water
- hardening agent
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Abstract
The invention discloses a hardening agent suitable for precise casting of a water glass mould casing, and a preparation method of the hardening agent. The hardening agent consists of the following components in parts by weight: 15-25 parts of sodium chloride, 5-12 parts of calcium carbonate, 1-3 parts of hydrochloric acid and 70-80 parts of water. The hardening agent adopts industrial sodium chloride, calcium carbonate and hydrochloric acid, and is low in raw material cost; a process for precise casting of the water glass mould casing only generates carbon dioxide, and pollution can be avoided; the mould casing hardening period is short; a casting cast by the prepared mould casing is easy to clean and good in surface quality. The hardening agent and the reparation method thereof have the advantages that the reparation method is simple, the cost is low, pollution gas discharge is avoided, and the hardening period is short. According to a formula for the hardening agent, organic ester high in cost, aluminium chloride difficult for sand cleaning after the casting is cast by the mould casing, and ammonium chloride generating plenty of ammonia gas to influence worker health, cause environmental pollution and corrode machinery equipment, in the conventional water glass mould casing hardening process can be replaced.
Description
Technical field
The present invention relates to hot investment casting field, what especially relate to a kind of large-scaled complex castings is suitable for curing agent of waterglass precision casting shell and preparation method thereof.
Background technology
In hot investment casting industry at home, the precision casting technology of sodium silicate shell has very important status.Until today, using waterglass as the use at home of the full form casting process of binding agent still widely.The precision casting technology of domestic sodium silicate shell obtains extensive use following main cause: (1) and other two kinds of conventional adhesive silicon sol and silicate hydrolyzate liquor ratio are comparatively, what water glass type casing tech adopted is wet method shell, hardening by chemical method can make shell harden rapidly and then set up wet strength, production cycle is shorter, and production efficiency is higher.(2) waterglass has more stable performance, and the impact that refractory powder produces the chemical stability of its coating is very little, and relative to other binding agents, waterglass is little to the requirement of the temperature of production scene, humidity, therefore its production control is more simple.(3) waterglass price is lower, production cost both can have been made to reduce, can ensure the quality of products again; Lower to environmental protection requirement, be applicable to large batch of production.
Waterglass is widely used in casting industry as binding agent, has carried out extensive research both at home and abroad to its curing agent.Traditional Kind Hardener of Sodium Silicate kind is more, as organic ester, aluminium chloride, ammonium chloride etc., respectively has inferior position.Wherein, organic ester has higher intensity and good collapsibility as the sodium silicate shell that curing agent hardens, and be a kind of reasonable curing agent, but its price is higher.Aluminium chloride is the curing agent relatively commonly used, but it also exists three subject matters in production application: one is that firm time is longer because the low setting rate caused of its infiltration hardening capacity is comparatively slow; Two is that the defect that its sclerosis shell surface exists is more, and the surface smoothness of foundry goods is poor; Three is because the retained strength of its sclerosis shell is high and collapsibility is poor, causes cast cleaning difficulty.Ammonium chloride is also the curing agent be widely used, to grasp when the season of plum rains, cold sensation of the genitalia and to control the degree of its drying comparatively difficult, have a strong impact on casting quality, the ammonia that particularly ammonium chloride solution produces corrodes machinery equipment, causes environmental pollution, infringement workman's is healthy, and the environmental administration of existing China has forbidden that enterprise uses.
Summary of the invention
First object of the present invention is to provide a kind of curing agent being suitable for waterglass precision casting shell, the formula of this curing agent can substitute and produce a large amount of ammonia in the aluminium chloride of sand removal difficulty after expensive organic ester, shell pouring cast part in current Hardening of Sodium Silicate Ceramic Shell process and hardening process and affect the ammonium chloride that workman is healthy, cause environmental pollution, corrosion machinery equipment, it has, and cost is low, the advantage of uncontaminated gases discharge, the casting strength of made shell cast is high, easy to clean, and surface quality is good.
Second object of the present invention is to provide that a kind of compound method is simple, curing cycles is short, cost is low, the free of contamination preparation method being suitable for waterglass precision casting shell.
First object of the present invention is achieved in that
Be suitable for a curing agent for waterglass precision casting shell, feature is: be made up of in the sodium chloride of mass fraction, calcium carbonate, hydrochloric acid and water following, wherein:
Sodium chloride: 15 ~ 25 parts, calcium carbonate: 5 ~ 12 parts, hydrochloric acid: 1 ~ 3 part, water: 70 ~ 80 parts.
Sodium chloride is industrial sodium chloride (NaCl >=95), and calcium carbonate is industrial calcium carbonate, and hydrochloric acid is the hydrochloric acid of concentration 36 parts, and water is water for industrial use.
Second object of the present invention is achieved in that
Be suitable for a preparation method for waterglass precision casting shell, feature is: concrete steps are as follows:
A, the water first getting 70 ~ 80 parts put into sclerosis pond, add again in water 15 ~ 25 parts sodium chloride powder (title must be consistent, before be sodium chloride, there is no this word of powder), allow sodium chloride fully dissolve, obtain sodium chloride solution;
B, in sodium chloride solution, add the calcium carbonate of 5 ~ 12 parts, calcium carbonate is slightly soluble in water, stirs and forms turbid solution;
C, in turbid solution, slowly inject the hydrochloric acid of 1 ~ 3 part again, and fully stir;
D, finally casting shell molds is put in sclerosis pond and hardens 3-5 minute, take out and namely complete shell.
Curing agent of the present invention adds excessive calcium carbonate in closely saturated sodium-chloride water solution, then after adding hydrochloric acid, the H in calcium carbonate and hydrochloric acid
+chemical reaction occurs, and this reaction consumes the H in colloidal sol
+, and discharge CO
2gas.Waterglass and CO
2react generation silicic acid, and this silicic acid exists with the form of colloid, and reversible reaction is dissociated into H
2siO
4 2-and H
3siO
4 ?.Closely saturated sodium-chloride water solution as strong electrolytic solution, in and the electric charge of silicic acid micelle, the warm-up movement accelerating its micelle with increase micelle in conjunction with chance, impel the phenomenon that siliceous colloid is assembled, coagulation occurs, thus forms silicic acid gel, last silicic acid gel loses Bound moisture and generates SiO
2, shell is solidified.
Experiment shows, excessive calcium carbonate finally can be adsorbed on shell surface after sclerosis on a small quantity, and this is because calcium carbonate has powerful adhesive force, is adsorbed on silicic acid gel surface, can make shell smooth surface after solidification, compact,
Without micro mist abscission.
The present invention's curing agent used is industrial chlorinations sodium, calcium carbonate and hydrochloric acid, and the cost of raw material is low; Meanwhile, in waterglass precision casting shell process, only generate carbon dioxide, pollution-free; Shell curing cycles is short; And the foundry goods easy to clean of made shell cast, surface quality is good.
Therefore, the present invention has the advantage that compound method is simple, cost is low, uncontaminated gases discharges, curing cycles is short, the casting strength of made shell cast is high, easy to clean, surface quality is good, and the formula of this curing agent can substitute and produce a large amount of ammonia in the aluminium chloride of sand removal difficulty after expensive organic ester, shell pouring cast part in current Hardening of Sodium Silicate Ceramic Shell process and hardening process and affect the ammonium chloride that workman is healthy, cause environmental pollution, corrosion machinery equipment.
Under hydrochloric acid acid condition of the present invention, the chemical reaction of the sodium chloride-calcium carbonate shell sclerosis of (not too clear and coherent) is as follows:
CaCO
3+ 2H
+= Ca
2+ + H
2O + CO
2↑ （1）
Na
2O.mSiO
2.n H
2O + CO
2= Na
2CO
3+ mSi(OH)
4+nH
2O （2）
Si(OH)
4?H
4SiO
4?H
2SiO
4 2- +2 H
+?H
3SiO
4 ?+ H
+ （3）
H
4SiO
4=SiO
2+2 H
2O （4）。
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further elaborated, it should be noted that the time of sclerosis can set according to different technique.
Embodiment 1:
The water first getting 70 parts puts into sclerosis pond, adds the sodium chloride of 25 parts, allow sodium chloride fully dissolve in water; Add the calcium carbonate of 5 parts again, calcium carbonate is slightly soluble in water, stirs and forms turbid solution; Then the hydrochloric acid of 2 parts is slowly injected again, and fully stir; At this moment the H in calcium carbonate and hydrochloric acid
+there is chemical reaction, and discharge CO
2gas.Finally casting shell molds is put in sclerosis pond and hardens 3 minutes, complete shell.During sclerosis, the waterglass in shell and CO
2react generation silicic acid, and this silicic acid exists with the form of colloid, is reversiblely dissociated into H
2siO
4 2-and H
3siO
4 ?.Sodium-chloride water solution as electrolyte solution, in and the electric charge of silicic acid micelle, impel the phenomenon that siliceous colloid is assembled, coagulation occurs, thus form silicic acid gel, after sclerosis, shell takes out dry, and silicic acid gel loses Bound moisture generation SiO
2, shell is solidified.
Embodiment 2:
The water first getting 75 parts puts into sclerosis pond, adds the sodium chloride of 20 parts, allow sodium chloride fully dissolve in water; Add the calcium carbonate of 10 parts again, calcium carbonate is slightly soluble in water, stirs and forms turbid solution; Then slowly inject the hydrochloric acid of 3 parts again, and fully stir; At this moment the H in calcium carbonate and hydrochloric acid
+there is chemical reaction, and discharge CO
2gas.Finally casting shell molds is put into the sclerosis in 5 minutes of sclerosis pond, completes shell.During sclerosis, waterglass and CO in shell
2react generation silicic acid, and this silicic acid exists with the form of colloid, is reversiblely dissociated into H
2siO
4 2-and H
3siO
4 ?.Sodium-chloride water solution as electrolyte solution, in and the electric charge of silicic acid micelle, impel the phenomenon that siliceous colloid is assembled, coagulation occurs, thus form silicic acid gel, after sclerosis, shell takes out dry, and silicic acid gel loses Bound moisture generation SiO
2, shell is solidified.
Embodiment 3:
The water first getting 73 parts puts into sclerosis pond, adds the sodium chloride of 15 parts, allow sodium chloride fully dissolve in water; Add the calcium carbonate of 12 parts again, calcium carbonate is slightly soluble in water, stirs and forms turbid solution; Then slowly inject the hydrochloric acid of 3 parts again, and fully stir; At this moment the H in calcium carbonate and hydrochloric acid
+there is chemical reaction, and discharge CO
2gas.Finally casting shell molds is put into the sclerosis in 5 minutes of sclerosis pond, completes shell.During sclerosis, waterglass and CO in shell
2react generation silicic acid, and this silicic acid exists with the form of colloid, is reversiblely dissociated into H
2siO
4 2-and H
3siO
4 ?.Sodium-chloride water solution as electrolyte solution, in and the electric charge of silicic acid micelle, impel the phenomenon that siliceous colloid is assembled, coagulation occurs, thus form silicic acid gel, after sclerosis, shell takes out dry, and silicic acid gel loses Bound moisture generation SiO
2, shell is solidified.
Embodiment 4:
The water first getting 77 parts puts into sclerosis pond, adds the sodium chloride of 18 parts, allow sodium chloride fully dissolve in water; Add the calcium carbonate of 8 parts again, calcium carbonate is slightly soluble in water, stirs and forms turbid solution; Then slowly inject the hydrochloric acid of 2 parts again, and fully stir; At this moment the H in calcium carbonate and hydrochloric acid
+there is chemical reaction, and discharge CO
2gas.Finally casting shell molds is put into the sclerosis in 4 minutes of sclerosis pond, completes shell.During sclerosis, waterglass and CO in shell
2react generation silicic acid, and this silicic acid exists with the form of colloid, is reversiblely dissociated into H
2siO
4 2-and H
3siO
4 ?.Sodium-chloride water solution as electrolyte solution, in and the electric charge of silicic acid micelle, impel the phenomenon that siliceous colloid is assembled, coagulation occurs, thus form silicic acid gel, after sclerosis, shell takes out dry, and silicic acid gel loses Bound moisture generation SiO
2, shell is solidified.
Embodiment 5:
The water first getting 80 parts puts into sclerosis pond, adds the sodium chloride of 22 parts, allow sodium chloride fully dissolve in water; Add the calcium carbonate of 5 parts again, calcium carbonate is slightly soluble in water, stirs and forms turbid solution; Then slowly inject the hydrochloric acid of 1 part again, and fully stir; At this moment the H in calcium carbonate and hydrochloric acid
+there is chemical reaction, and discharge CO
2gas.Finally casting shell molds is put into the sclerosis in 5 minutes of sclerosis pond, completes shell.During sclerosis, waterglass and CO in shell
2react generation silicic acid, and this silicic acid exists with the form of colloid, is reversiblely dissociated into H
2siO
4 2-and H
3siO
4 ?.Sodium-chloride water solution as electrolyte solution, in and the electric charge of silicic acid micelle, impel the phenomenon that siliceous colloid is assembled, coagulation occurs, thus form silicic acid gel, after sclerosis, shell takes out dry, and silicic acid gel loses Bound moisture generation SiO
2, shell is solidified.
Claims (3)
1. be suitable for a curing agent for waterglass precision casting shell, it is characterized in that: be made up of in the sodium chloride of mass fraction, calcium carbonate, hydrochloric acid and water following, wherein:
Sodium chloride: 15 ~ 25 parts, calcium carbonate: 5 ~ 12 parts, hydrochloric acid: 1 ~ 3 part, water: 70 ~ 80 parts.
2. curing agent according to claim 1, is characterized in that: sodium chloride is industrial sodium chloride: NaCl >=95 part, and calcium carbonate is industrial calcium carbonate, and hydrochloric acid is the hydrochloric acid of concentration 36 parts, and water is water for industrial use.
3. be suitable for a preparation method for waterglass precision casting shell, it is characterized in that:
A, the water first getting 70 ~ 80 parts put into sclerosis pond, add again in water 15 ~ 25 parts sodium chloride powder (title must be consistent, before be sodium chloride, there is no this word of powder), allow sodium chloride fully dissolve, obtain sodium chloride solution;
B, in sodium chloride solution, add the calcium carbonate of 5 ~ 12 parts, calcium carbonate is slightly soluble in water, stirs and forms turbid solution;
C, in turbid solution, slowly inject the hydrochloric acid of 1 ~ 3 part again, and fully stir;
D, finally casting shell molds is put in sclerosis pond and hardens 3-5 minute, take out and namely complete shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460141.6A CN104942219B (en) | 2015-07-31 | 2015-07-31 | Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460141.6A CN104942219B (en) | 2015-07-31 | 2015-07-31 | Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent |
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| Publication Number | Publication Date |
|---|---|
| CN104942219A true CN104942219A (en) | 2015-09-30 |
| CN104942219B CN104942219B (en) | 2017-01-18 |
Family
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|---|---|---|---|
| CN201510460141.6A Expired - Fee Related CN104942219B (en) | 2015-07-31 | 2015-07-31 | Hardening agent suitable for precise casting of water glass mould casing and preparation method of hardening agent |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3615755A (en) * | 1970-01-14 | 1971-10-26 | Mitsubishi Heavy Ind Ltd | Method for making a mold using manganese carbonate |
| SU831331A1 (en) * | 1979-11-16 | 1981-05-23 | Каширский Литейный Завод "Центролит" | Complex-curing agent for sand/resin mixtures for producing casting ceramic moulds |
| JPS62144847A (en) * | 1985-12-20 | 1987-06-29 | Chuo Denki Kogyo Kk | Quickly collapsible casting mold |
| CN1895813A (en) * | 2005-07-14 | 2007-01-17 | 李士良 | Lost-wax composite hardener |
| CN102744361A (en) * | 2012-08-01 | 2012-10-24 | 青岛三合山精密铸造有限公司 | Precise casing and shell-manufacturing method for sodium silicate |
| CN102762512A (en) * | 2009-12-16 | 2012-10-31 | 亚世科化学有限公司 | Foundry mixes containing carbonate salts and their uses |
| CN103157761A (en) * | 2011-12-19 | 2013-06-19 | 东风精密铸造有限公司 | Investment casting water glass type shell fast hardening liquid |
| CN103273001A (en) * | 2013-05-29 | 2013-09-04 | 宝鸡市盟发汽车部件有限责任公司 | Mixed hardener applied to hardening of investment casting shells |
| CN104741506A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Binder hardening accelerator for casting |
-
2015
- 2015-07-31 CN CN201510460141.6A patent/CN104942219B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3615755A (en) * | 1970-01-14 | 1971-10-26 | Mitsubishi Heavy Ind Ltd | Method for making a mold using manganese carbonate |
| SU831331A1 (en) * | 1979-11-16 | 1981-05-23 | Каширский Литейный Завод "Центролит" | Complex-curing agent for sand/resin mixtures for producing casting ceramic moulds |
| JPS62144847A (en) * | 1985-12-20 | 1987-06-29 | Chuo Denki Kogyo Kk | Quickly collapsible casting mold |
| CN1895813A (en) * | 2005-07-14 | 2007-01-17 | 李士良 | Lost-wax composite hardener |
| CN102762512A (en) * | 2009-12-16 | 2012-10-31 | 亚世科化学有限公司 | Foundry mixes containing carbonate salts and their uses |
| CN103157761A (en) * | 2011-12-19 | 2013-06-19 | 东风精密铸造有限公司 | Investment casting water glass type shell fast hardening liquid |
| CN102744361A (en) * | 2012-08-01 | 2012-10-24 | 青岛三合山精密铸造有限公司 | Precise casing and shell-manufacturing method for sodium silicate |
| CN103273001A (en) * | 2013-05-29 | 2013-09-04 | 宝鸡市盟发汽车部件有限责任公司 | Mixed hardener applied to hardening of investment casting shells |
| CN104741506A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Binder hardening accelerator for casting |
Non-Patent Citations (2)
| Title |
|---|
| 吴国栋: "酸性水玻璃化学注浆材料的实验研究及注浆工艺设计", 《中国优秀硕士学位论文全文数据库(工程科技Ⅱ辑)》 * |
| 肖尊群等: "碳酸钙-酸性水玻璃注浆材料对比试验", 《中南大学学报(自然科学版)》 * |
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|---|---|
| CN104942219B (en) | 2017-01-18 |
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